FILTRATE IMPROVER FOR HOUSING MATERIAL AND FILTRATE IMPROVING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a filtrate improver improving filtration property during papermaking manufacturing of a fiber mixed sheet and a simple filtration improving method capable of reducing curing and hardening time of the papermade fiber mixed sheet, high in dimensional accuracy of a manufactured product and capable of maintaining required strength as the product.;SOLUTION: There is provided a filtration improver used for papermaking manufacturing a fiber mixed sheet in a housing board and containing a copolymer of dimethylamino ethyl(meth)acrylate methylchloride quaternary salt and/or dimethylamino ethyl(meth)acrylate methyl chloride quaternary salt, which is a linear cation polymer with molecular weight of 1,000,000 to 5,000,000 and acrylamide. there is provided a filtration improver preferably having copolymerization ratio of the acrylamide in all monomer of the linear cation polymer of 0 to 70 mol%. There is provided a filtration improving method of the fiber mixed sheet by adding the filtration improver to a raw material slurry before papermaking of the fiber mixed sheet during papermaking manufacturing of the fiber mixed sheet in a housing board.;SELECTED DRAWING: None;COPYRIGHT: (C)2018,JPO&INPIT